| SOUTHWASTE EMPLOYMENT LLC NV | Administrative & Waste Services | 0 | — | F |
| SOUTHWASTE EMPLOYMENT LLC TX | Administrative & Waste Services | 0 | — | F |
| Southway Crane & Rigging AL | Construction | 0 | — | D |
| Southway Crane & Rigging FL | Construction | 0 | — | F |
| Southway Crane & Rigging GA | Construction | 0 | — | C |
| Southway Crane & Rigging SC | Construction | 0 | — | D |
| Southway Crane & Rigging-Columbia SC | Construction | 0 | — | D |
| Southway Mac Haik Ford LTD TX | Retail Trade | 0 | — | C |
| SouthWest AZ | Construction | 0 | — | D |
| Southwest NH | — | 0 | — | — |
| SouthWest NM | Construction | 0 | — | F |
| SouthWest NV | Construction | 0 | — | D |
| Southwest - Customer Service & Support TX | — | 0 | — | — |
| Southwest - Customer Service and Support TX | — | 0 | — | — |
| Southwest - Dallas Lovefield Airport TX | — | 0 | — | — |
| Southwest - San Antonio Int'l Airport TX | — | 0 | — | — |
| Southwest - William P. Hobby TX | — | 0 | — | — |
| Southwest - William P. Hobby Airport TX | — | 0 | — | — |
| Southwest Abatement, Inc. NM | Administrative & Waste Services | 0 | — | F |
| Southwest Abatement, Inc. TX | Administrative & Waste Services | 0 | — | A |
| Southwest Administrators, Inc. CA | — | 0 | — | — |
| Southwest Airlines AL | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines AR | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines AZ | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines CA | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines CO | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines CT | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines FL | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines GA | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines HI | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines ID | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines IL | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines IN | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines KS | Transportation & Warehousing | 0 | — | A |
| Southwest Airlines KY | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines LA | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MA | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MD | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MI | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MN | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MO | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MS | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines MT | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NC | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NE | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NH | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NM | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NV | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines NY | Transportation & Warehousing | 0 | — | F |
| Southwest Airlines OH | Transportation & Warehousing | 0 | — | F |
